Why Cast Trunnions SUCK!

Published on June 6, 2018
Duration: 10:44

This video thoroughly explains the critical differences between cast, billet, and forged AK trunnions. Cast trunnions are identified as weak due to porosity and lack of grain structure, often used to cut costs in budget AKs. Billet trunnions, machined from solid steel, offer better strength, while forged trunnions are the strongest due to aligned grain structure, representing the military standard.

Quick Summary

Cast AK trunnions are weak due to porosity and lack of grain structure, often used in budget firearms to cut costs. Billet trunnions are machined from solid steel for better strength, while forged trunnions are the strongest, with grain structure aligned to the part's geometry, representing the military standard.

Chapters

  1. 00:00Intro: AK Trunnion Manufacturing Methods
  2. 00:40Problems with Cast Trunnions Explained
  3. 01:57Why Manufacturers Use Casting (Cost)
  4. 03:31Billet Machined Trunnions: Strength & Process
  5. 05:41Forged Trunnions: The Superior Standard
  6. 07:59Summary: Cast vs Billet vs Forged & Recommendations

Frequently Asked Questions

What are the main problems with cast AK trunnions?

Cast trunnions suffer from porosity (tiny air bubbles) and a lack of a defined grain structure. This makes the metal inherently weaker and more susceptible to failure compared to billet or forged components, especially under stress.

Why do some AK manufacturers use cast trunnions?

Cast trunnions are primarily used to reduce manufacturing costs. This allows manufacturers to produce more affordable AK variants, often found in the budget range below $700-$800, making them attractive to cost-conscious buyers.

What is the difference between billet and forged trunnions?

Billet trunnions are machined from a solid block of steel, offering good strength and consistent grain. Forged trunnions are shaped using dies and immense pressure, which aligns the grain structure with the part's geometry, resulting in the strongest and densest component.

Which type of AK trunnion is the best?

Forged trunnions are considered the gold standard due to their superior strength and durability, aligning with military specifications. Billet trunnions are a strong second option, while cast trunnions are generally considered the weakest and least desirable.

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